Weather on May 21
Saint Louis, MO
55 Years of Data
About This Date
May 21st in Saint Louis, MO typically brings pleasant spring weather, with average highs around 78°F and lows near 57°F. Over 54 years of records, the warmest May 21st was in 1972 (80°F average), while the coldest was 2002 (53°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 22% of May 21st dates historically, with the wettest May 21st recording 4.98" of rain. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Saint Louis, MO? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 69° | 53° | 61° | — | — |
| 2025 | 73° | 57° | 65° | — | — |
| 2024 | 90° | 68° | 79° | 1.14" | — |
| 2023 | 79° | 47° | 63° | — | — |
| 2022 | 80° | 57° | 69° | 4.6" | — |
| 2021 | 86° | 66° | 76° | — | — |
| 2020 | 67° | 56° | 61° | 0.1" | — |
| 2019 | 73° | 49° | 61° | 4.98" | — |
| 2018 | 80° | 66° | 73° | — | — |
| 2017 | — | 60° | — | — | — |
| 2016 | 72° | 53° | 62° | — | — |
| 2015 | 65° | 47° | 56° | — | — |
| 2014 | 88° | 69° | 78° | — | — |
| 2013 | 82° | 63° | 72° | 3.4" | — |
| 2012 | 90° | 59° | 74° | 0.15" | — |
| 2011 | 81° | 65° | 73° | 0.1" | — |
| 2010 | 65° | 57° | 61° | 0.74" | — |
| 2009 | 81° | 53° | 67° | — | — |
| 2008 | 67° | 46° | 56° | — | — |
| 2007 | 82° | 52° | 67° | — | — |
| 2006 | 72° | 53° | 62° | — | — |
| 2005 | 67° | 52° | 59° | — | — |
| 2004 | 87° | 71° | 79° | — | — |
| 2003 | 70° | 53° | 61° | — | — |
| 2002coldest | 64° | 42° | 53° | — | — |
| 2001 | 78° | 59° | 69° | 1.12" | — |
| 2000 | 64° | 45° | 54° | — | — |
| 1999 | 78° | 58° | 68° | — | — |
| 1998 | 85° | 71° | 78° | — | — |
| 1997 | 69° | 46° | 58° | — | — |
| 1996 | 88° | 59° | 73° | 0.15" | — |
| 1995 | 76° | 58° | 67° | 2.03" | — |
| 1994 | 80° | 54° | 67° | — | — |
| 1993 | 71° | 41° | 56° | — | — |
| 1992 | 81° | 66° | 73° | — | — |
| 1991 | 82° | 67° | 74° | — | — |
| 1990 | 72° | 52° | 62° | — | — |
| 1989 | 78° | 60° | 69° | — | — |
| 1988 | 89° | 60° | 75° | — | — |
| 1987 | 88° | 60° | 74° | — | — |
| 1986 | 72° | 51° | 61° | — | — |
| 1985 | 77° | 58° | 67° | 0.05" | — |
| 1984 | 84° | 65° | 74° | — | — |
| 1981 | 72° | 45° | 58° | — | — |
| 1980 | 77° | 57° | 67° | — | — |
| 1979 | 73° | 55° | 64° | — | — |
| 1978 | 81° | 55° | 68° | — | — |
| 1977 | 89° | 60° | 75° | — | — |
| 1976 | 83° | 56° | 69° | — | — |
| 1975 | 89° | 61° | 75° | — | — |
| 1974 | 90° | 68° | 79° | — | — |
| 1973 | 77° | 55° | 66° | — | — |
| 1972warmest | 92° | 68° | 80° | — | — |
| 1971 | 76° | 46° | 61° | — | — |
Saint Louis, MO Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Saint Louis, MO Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Saint Louis, MO Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Saint Louis, MO
Saint Louis, MO has no months that meet our "pleasant" threshold — every season has tradeoffs.